Chemical Engineering March 2019 - 44

Cover Story
Wireless sensor
12
11.5
11
10.5
10
9.5
9
8.5
8
1-4-2012
14-8-2013
FIGURE 5. When wall-thickness
data points are provided
continuously, it becomes clear
that metal loss is not a
linear process
27-12-2014
Time
of accuracy than is likely possible in real life,
the readings show a 1-mm reduction of wall
thickness over that time period, indicating
fairly aggressive corrosion. The conclusion
based on two data points will suggest a
more-or-less straight-line change (Figure
4) over the year. Looking at the same measurement
point logged with a continuous
10-5-2016
0.3 mm/yr
1.1 mm/yr
0.1 mm/yr
1.0 mm/yr
0.0 mm/yr
22-9-2017
4-2-2019
monitor will far more likely show a jagged
curve (Figure 5), where there are periods of
rapid loss interspersed with times of very
little change.
Corrosion happens at highly variable
rates because there are so many variable
factors at play. Some of the factors
are controlled - for example, the injection
rate of a corrosion inhibitor or the operating
temperature of a reactor - and others
are not, such as the specific corrosion profiles
that are brought into the process by
the feedstock.
Trying to diagnose and solve the problem
when there are very few data points is effectively
impossible. Intrusive corrosion probes
capable of giving an indication of the corrosiveness
of the fluid and test coupons
have their value, but they do not, on their
own, deliver the most important measurement:
actual metal loss, or lack thereof, in
real time.
A case in point
The corrosion picture for a petroleum refinery
is hugely complex, and some facilities
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UT measurement, mm
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Chemical Engineering March 2019

Table of Contents for the Digital Edition of Chemical Engineering March 2019

Contents
Chemical Engineering March 2019 - Cover1
Chemical Engineering March 2019 - Cover2
Chemical Engineering March 2019 - Contents
Chemical Engineering March 2019 - 2
Chemical Engineering March 2019 - 3
Chemical Engineering March 2019 - 4
Chemical Engineering March 2019 - 5
Chemical Engineering March 2019 - 6
Chemical Engineering March 2019 - 7
Chemical Engineering March 2019 - 8
Chemical Engineering March 2019 - 9
Chemical Engineering March 2019 - 10
Chemical Engineering March 2019 - 11
Chemical Engineering March 2019 - 12
Chemical Engineering March 2019 - 13
Chemical Engineering March 2019 - 14
Chemical Engineering March 2019 - 15
Chemical Engineering March 2019 - 16
Chemical Engineering March 2019 - 17
Chemical Engineering March 2019 - 18
Chemical Engineering March 2019 - 19
Chemical Engineering March 2019 - 20
Chemical Engineering March 2019 - 21
Chemical Engineering March 2019 - 22
Chemical Engineering March 2019 - 23
Chemical Engineering March 2019 - 24
Chemical Engineering March 2019 - 25
Chemical Engineering March 2019 - 26
Chemical Engineering March 2019 - 27
Chemical Engineering March 2019 - 28
Chemical Engineering March 2019 - 29
Chemical Engineering March 2019 - 30
Chemical Engineering March 2019 - 31
Chemical Engineering March 2019 - 32
Chemical Engineering March 2019 - 33
Chemical Engineering March 2019 - 34
Chemical Engineering March 2019 - 35
Chemical Engineering March 2019 - 36
Chemical Engineering March 2019 - 37
Chemical Engineering March 2019 - 38
Chemical Engineering March 2019 - 39
Chemical Engineering March 2019 - 40
Chemical Engineering March 2019 - 41
Chemical Engineering March 2019 - 42
Chemical Engineering March 2019 - 43
Chemical Engineering March 2019 - 44
Chemical Engineering March 2019 - 45
Chemical Engineering March 2019 - 46
Chemical Engineering March 2019 - 47
Chemical Engineering March 2019 - 48
Chemical Engineering March 2019 - 49
Chemical Engineering March 2019 - 50
Chemical Engineering March 2019 - 51
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Chemical Engineering March 2019 - 53
Chemical Engineering March 2019 - 54
Chemical Engineering March 2019 - 55
Chemical Engineering March 2019 - 56
Chemical Engineering March 2019 - 57
Chemical Engineering March 2019 - 58
Chemical Engineering March 2019 - 59
Chemical Engineering March 2019 - 60
Chemical Engineering March 2019 - 61
Chemical Engineering March 2019 - 62
Chemical Engineering March 2019 - 63
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Chemical Engineering March 2019 - 65
Chemical Engineering March 2019 - 66
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Chemical Engineering March 2019 - 68
Chemical Engineering March 2019 - 69
Chemical Engineering March 2019 - 70
Chemical Engineering March 2019 - 71
Chemical Engineering March 2019 - 72
Chemical Engineering March 2019 - 73
Chemical Engineering March 2019 - 74
Chemical Engineering March 2019 - 75
Chemical Engineering March 2019 - 76
Chemical Engineering March 2019 - Cover3
Chemical Engineering March 2019 - Cover4
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